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Magnetic dilution effect and topological phase transitions in (Mn$ {1-x}$Pb$ x$)Bi$ 2$Te$ 4$ by Qian, Tiema; Yao, Yueh-Ting; Hu, Chaowei; Feng, Erxi; Cao, Huibo; Mazin, Igor I.; Chang, Tay-Rong; Ni, Ni is a scholarly article available to read on EtoBox.

What is Magnetic dilution effect and topological phase transitions in (Mn$ {1-x}$Pb$ x$)Bi$ 2$Te$ 4$ about?

As the first intrinsic antiferromagnetic (AFM) topological insulator (TI), MnBi$_2$Te$_4$ has provided a material platform to realize various emergent phenomena arising from the interplay of magnetism and band topology. Here by investigating (Mn$_{1-x}$Pb$_x$)Bi$_2$Te$_4$ $(0\leq x \leq 0.82)$ single crystals via the x-ray, electrical transport, magnetometry and neutron measurements, chemical analysis, external pressure, and first-principles calculations, we reveal the magnetic dilution effect on the magnetism and band topology in MnBi$_2$Te$_4$. With increasing $x$, both lattice parameters $a$ and $c$ expand linearly by around 2\%. All samples undergo the paramagnetic to A-type antiferromagnetic transition with the N$\acute{e}$el temperature decreasing lineally from 24 K at $x=0$ to 2 K at $x=0.82$. Our neutron data refinement of the $x=0.37$ sample indicates that the ordered moment is 4.3(1)$\mu_B$/Mn at 4.85 K and the amount of the Mn$_{\rm{Bi}}$ antisites is negligible within the error bars. Isothermal magnetization data reveal a slight decrease of the interlayer plane-plane antiferromagnetic exchange interaction and a monotonic decrease of the magnetic anisotropy, due to dilut

Author

Qian, Tiema; Yao, Yueh-Ting; Hu, Chaowei; Feng, Erxi; Cao, Huibo; Mazin, Igor I.; Chang, Tay-Rong; Ni, Ni

Published

2022

Language

EN